SPOILER ALERT!

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Dead Witch Walking  - Kim Harrison

Guys I need spoilers! Please help a woman in need!

1. Who/what is Nick?

2. I have an idea what Trent is, but tell me if I'm wrong: elf

3. Will we see the characters from the 1st book(Ivy, Nick, Trent, Jon[hate his ass], Jenks) till later on aka ever?